Verified answer

а)25у-у³=y(25-y²)=y(5-y)(5+y)

б) -4х²+8ху-4у²=-4(x²-2xy+y²)=-4(x-y)²

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Verified answer

1) 25y-y^3=y(25-y^2)=y(5^2-y^2)=y(5-y)(5+y)

2) -4x^2+8xy-4y^2=-4(x^2-2xy+y^2)=-4(x-y)^2